Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1983-03-28
1985-04-23
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335195, 335196, H01H 7702
Patent
active
045132674
ABSTRACT:
A so-called blow-off type current limiting circuit breaker includes a stationary contact strap that is divided into three elongated closely spaced coplanar parallel arms that are connected to each other at one end of the strap. The stationary contact is mounted to the interior one of the parallel arms at the end thereof remote from the one end of the strap. A terminal portion of the strap connects exterior ones of the parallel arms to one another at the ends thereof remote from the one end of the strap. A movable contact engageable with and disengageable from the stationary contact is mounted to one end of a movable contact arm that is pivoted at its opposite end in the region of the one end of the strap, extending parallel to the arms of the strap and being aligned with the interior arm. Current in the interior arm flows in a direction opposite to the direction of current flow in the exterior arms and the movable contact arm. With the contact engaged, the interior arm and the movable contact arm are very close to one another so that upon the occurrence of severe fault current conditions, repelling electrodynamic forces of sufficient magnitude are developed between the movable contact arm and the interior arm to separate the contacts very rapidly, thereby limiting the magnitude of the fault current to a value within the rating of the circuit breaker.
REFERENCES:
patent: 3092699 (1963-06-01), Latour
patent: 3559119 (1971-01-01), Koennecke et al.
patent: 3663905 (1972-05-01), Kussy et al.
patent: 3921109 (1975-11-01), Hodgson
patent: 4001738 (1977-01-01), Terracol et al.
patent: 4023885 (1977-05-01), Snowdon et al.
Kussy Frank W.
McClellan David P.
Andrews George
Goldberg E. A.
James J. L.
Powers F. W.
Siemens-Allis, Inc.
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